Viljoen, Jozua Jakobus; Ganswindt, Andre; Palme, Rupert; Reynecke, Hendrik C.; Du Toit, Johan T.; Langbauer, William Richard(South African National Parks, 2008)
Steenkamp, Gerhardus; Ferguson, Jan Willem Helenus; Boy, Sonja Catharina; Ferreira, Sam M.; Bester, Marthan Nieuwoudt(South African Veterinary Association, 2008-03)